third_party/WebKit/LayoutTests/http/tests/serviceworker/chromium/service-worker-gc.html

   1 <!DOCTYPE html>
   2 <script src="/js-test-resources/js-test.js"></script>
   3 <script src="../resources/test-helpers.js"></script>
   4 <script>
   5 window.jsTestIsAsync = true;
   6 description('Test that ServiceWorker and ServiceWorkerRegistration are not garbage collected prematurely');
   7 var registrationObservation = null;
   8 var swObservation = null;
   9 var scope = base_path() + '../resources/gc';
  10
  11 if (!window.internals) {
  12     testFailed('This test requires internals.observeGC');
  13     finishJSTest();
  14 } else {
  15     setup();
  16 }
  17
  18 function setup() {
  19     var worker = '../resources/empty-worker.js';
  20     unregisterAndRegister(worker, scope).then(onRegister);
  21 }
  22
  23 function unregisterAndRegister(url, scope) {
  24     return navigator.serviceWorker.getRegistration(scope)
  25         .then(function(registration) {
  26             if (registration)
  27               return registration.unregister();
  28           })
  29         .then(function() {
  30             return navigator.serviceWorker.register(url, { scope: scope });
  31           })
  32         .catch(function(error) {
  33             testFailed('Could not register worker: ' + error);
  34             finishJSTest();
  35           });
  36 }
  37
  38 function onRegister(registration) {
  39     registrationObservation = internals.observeGC(registration);
  40     registration.addEventListener('updatefound', (function() {
  41         onUpdate(registration.installing);
  42     }));
  43 }
  44
  45 function onUpdate(sw) {
  46     swObservation = internals.observeGC(sw);
  47     sw.addEventListener('statechange', onStateChange);
  48 }
  49
  50 function onStateChange(event) {
  51     // Use setTimeout to ensure a fresh stack with no references to the worker.
  52     switch (event.target.state) {
  53     case 'activated':
  54         setTimeout(unregister, 0);
  55         break;
  56     case 'redundant':
  57         setTimeout(finish, 0);
  58         break;
  59     }
  60 }
  61
  62 function unregister() {
  63     // The worker has an event handler that can still receive the state change
  64     // to 'redundant', so it shouldn't be collected yet.
  65     gc();
  66     shouldBeFalse('registrationObservation.wasCollected');
  67     shouldBeFalse('swObservation.wasCollected');
  68     navigator.serviceWorker.getRegistration(scope)
  69       .then(function(registration) {
  70           registration.unregister();
  71         })
  72       .catch(function(error) {
  73           testFailed('Could not unregister worker: ' + error);
  74           finishJSTest();
  75         });
  76 }
  77
  78 function finish()
  79 {
  80     // The worker is 'redundant' but the registration holds a reference to it,
  81     // so it shouldn't be collected yet.
  82     // FIXME: When crbug.com/398355 is fixed, register a new script URL and
  83     // once the new worker is activated, check that the old worker is gc'd.
  84     gc();
  85     shouldBeFalse('registrationObservation.wasCollected');
  86     shouldBeFalse('swObservation.wasCollected');
  87     finishJSTest();
  88 }
  89 </script>